GerbMagic is a free Gerber and Protel PCB viewer.
BSEditor: Gerber Viewer is a free Gerber and Protel PCB viewer. It supports Gerber RS-274x and Protel ASCII PCB file formats (from Protel 1.57 to Protel 2.8) .
2. An extremely accurate vector converter from Gerber RS-274x and Protel ASCII PCB to Adobe (TM) PDF and PostScript(TM) format.
3. A fast, high-resolution software RIP (raster Image Processor) for Gerber RS-274x and Protel ASCII PCB. GerbMagic converts Gerber and Protel ASCII PCB into TIFF, BMP (Windows Bitmap) and RID. Up to 30,000 DPI has been tested with excellent performance.
With the Advent of cheap and extremely fast personal computers, high-resolution vector laser plotters are gradually being replaced by raster laser plotters. Raster Image Processing (RIP) can now be done by inexpensive computer software instead of expensive specialized hardware.
With GerbMagic, you can group a lot of Gerber and Protel files into a single page. You can MOVE, rotate, mirror, and toggle Polarity of each image on the page as you like. The new page can then be saved as PDF or PostScript format, remaining as vector image, or being directly rasterized into TIFF(Packbits), BMP or RID format. you can free download GerbMagic 3.6 now.